That diverter stem needs to be replaced. This is fairly straightforward, and does not even require that the main water be turned off.

A picture to identify your brand and model would be the next step.

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thanks. that sounds calming...I will get a pic. I can only share images, since these fixtures were here when we bought the house - I dont know what the former owners bought and the handles aren't labled

It's nice to have you guys on here to help us DIY'ers....always appreciate your time.